Iperf or Qperf of Linux detection network performance

Iperf is a network performance testing tool. Iperf can test the maximum TCP and UDP bandwidth performance. Iperf has a variety of parameters and UDP features that can be adjusted as needed. Iperf can report bandwidth, delay jitter, and packet loss.

Yum install qperf

Note: Please turn off the firewall on both sides before use.

Execute qperf directly on a server, acting as a server

The other one executes the following command to view the bandwidth, delay, and server configuration:

Qperf server ip address tcp_bw tcp_lat conf

For example: qperf 192.168.3.92 tcp_bw tcp_lat conf


We can also observe changes in bandwidth and latency by changing the size of the message (msg_size), such as from 1 byte to 64K, each time multiplying:

Qperf -oo msg_size:1:64K:*2 server ip address tcp_bw tcp_lat